Source: https://seerepo.com/compare/langflow-ai/langflow/vs/pydantic/pydantic-ai
Markdown source: https://seerepo.com/compare/langflow-ai/langflow/vs/pydantic/pydantic-ai.md
Description: langflow and pydantic-ai share 6 technologies: FastAPI, Vite, React, Rich, Pydantic, and dompurify. Both are written in Python.

# langflow vs pydantic-ai

langflow and pydantic-ai share 6 technologies: FastAPI, Vite, React, Rich, Pydantic, and dompurify. Both are written in Python.

- [langflow-ai/langflow](https://seerepo.com/r/langflow-ai/langflow): Langflow is a powerful tool for building and deploying AI-powered agents and workflows.
- [pydantic/pydantic-ai](https://seerepo.com/r/pydantic/pydantic-ai): How Python does AI. Agents, realtime voice, image generation, embeddings. Every model, every interface, typed end to end.

## What they share and what sets them apart

- In common: FastAPI, Vite, React, Rich, Pydantic, dompurify
- Only in langflow: pyarrow, oracledb, Redis, Google, OpenAI, uvicorn, AIOHTTP, react-router-dom, SQLAlchemy, cryptography, pyjwt, bcrypt, google-auth-oauthlib, firecrawl-py, LangChain, langchain-classic, MCP, exa-py, pillow, defusedxml, pypdf, markitdown, jsonschema, msgspec, validators, psutil, loguru, boto3, Tailwind CSS, class-variance-authority, tailwind-merge, xyflow, Radix UI, ag-grid-community, Framer, react-hotkeys-hook, use-stick-to-bottom, react-syntax-highlighter, ace-builds, Headless UI, cmdk, elkjs, react-day-picker, react-error-boundary, react-sortablejs, reactflow, Lucide, react-icons, @radix-ui/react-icons, react-markdown, remark-gfm, rehype-sanitize, rehype-raw
- Only in pydantic-ai: anyio, pydantic-ai-slim, OpenTelemetry, highlight.js, marked

## Side by side

| | langflow | pydantic-ai |
|---|---|---|
| Size | 1,446,517 lines written, 3,937 code files | 1,214,511 lines written, 1,068 code files |
| Who writes it | 1.5% of its commits signed by AI. With Claude Code, CodeRabbit, GitHub Copilot, Cursor, Codex, and Warp | 7.7% of its commits signed by AI. With Claude Code, Devin, GitHub Copilot, Cursor, and Codex |
| Activity | Last push November 4, 2026, 17,600 commits, 156,316 stars | Last push November 5, 2026, 5,276 commits, 21,037 stars |
| Tests | 3,083 test files. 35.1% of its code files have a test that imports them | 1,214 test files. 19% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, langflow or pydantic-ai?

langflow, with 1,446,517 lines written; pydantic-ai has 1,214,511.

The proof: [langflow-ai/langflow's code at commit 60999cc](https://github.com/langflow-ai/langflow/tree/60999cc9a7350e44dde3ef641baae864e10861f0)

### Which has more GitHub stars, langflow or pydantic-ai?

langflow, with 156,316 stars; pydantic-ai has 21,037.

The proof: [langflow-ai/langflow on GitHub](https://github.com/langflow-ai/langflow)

### Which has more tests, langflow or pydantic-ai?

langflow, with 3,083 test files; pydantic-ai has 1,214.

The proof: [langflow-ai/langflow's code at commit 60999cc](https://github.com/langflow-ai/langflow/tree/60999cc9a7350e44dde3ef641baae864e10861f0)

### Which was updated more recently, langflow or pydantic-ai?

pydantic-ai: its last push was on November 5, 2026, and langflow's on November 4, 2026.

The proof: [pydantic/pydantic-ai's commits on GitHub](https://github.com/pydantic/pydantic-ai/commits)

### Which has more commits signed by AI, langflow or pydantic-ai?

pydantic-ai: an AI signed 7.7% of its commits, with Claude Code, Devin, GitHub Copilot, Cursor, and Codex; in langflow, 1.5%.

The proof: [the commits each tool signed in pydantic/pydantic-ai](https://seerepo.com/r/pydantic/pydantic-ai/ai)

## Sources

- langflow-ai/langflow: Read on November 4, 2026, at commit 60999cc (https://github.com/langflow-ai/langflow/tree/60999cc9a7350e44dde3ef641baae864e10861f0)
- pydantic/pydantic-ai: Read on November 5, 2026, at commit c8bdab3 (https://github.com/pydantic/pydantic-ai/tree/c8bdab333f248d09fa61cf32144fecad70e88fa9)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.